Module euphorie.client.browser.organisation, line 445, in
notify_inviter
Module <decorator-gen-3>, line 2, in send_email
Module plone.api.validation, line 81, in wrapped
Module plone.api.portal, line 198, in send_email
Module Products.MailHost.MailHost, line 215, in send
Module Products.MailHost.MailHost, line 337, in _send
Module zope.sendmail.delivery, line 141, in send
ValueError: Malformed Message-Id header
It causes this error: